Along Whitehall, where guards try mightily to ignore buffoonish tourists who try to get them to crack a smile, this tiny museum pays soporific tribute to the martial ceremonies of the Queen’s Life Guard. You might see troopers groom horses through a glass partition or regard cases of uniforms and regalia with glazed eyes, but—nothing against these dedicated men—you won’t get much back on your investment. On the hour, mounted dutymen change, and at 11am, the Life Guard changes, but you can see those outside for free.